1 #include <linux/delay.h> 2 #include <linux/gpio/consumer.h> 3 #include <linux/i2c.h> 4 #include <linux/interrupt.h> 5 #include <linux/jiffies.h> 6 #include <linux/module.h> 7 #include <linux/mutex.h> 8 #include <linux/of.h> 9 #include <linux/phy.h> 10 #include <linux/platform_device.h> 11 #include <linux/rtnetlink.h> 12 #include <linux/slab.h> 13 #include <linux/workqueue.h> 14 15 #include "mdio-i2c.h" 16 #include "sfp.h" 17 #include "swphy.h" 18 19 enum { 20 GPIO_MODDEF0, 21 GPIO_LOS, 22 GPIO_TX_FAULT, 23 GPIO_TX_DISABLE, 24 GPIO_RATE_SELECT, 25 GPIO_MAX, 26 27 SFP_F_PRESENT = BIT(GPIO_MODDEF0), 28 SFP_F_LOS = BIT(GPIO_LOS), 29 SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT), 30 SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE), 31 SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT), 32 33 SFP_E_INSERT = 0, 34 SFP_E_REMOVE, 35 SFP_E_DEV_DOWN, 36 SFP_E_DEV_UP, 37 SFP_E_TX_FAULT, 38 SFP_E_TX_CLEAR, 39 SFP_E_LOS_HIGH, 40 SFP_E_LOS_LOW, 41 SFP_E_TIMEOUT, 42 43 SFP_MOD_EMPTY = 0, 44 SFP_MOD_PROBE, 45 SFP_MOD_PRESENT, 46 SFP_MOD_ERROR, 47 48 SFP_DEV_DOWN = 0, 49 SFP_DEV_UP, 50 51 SFP_S_DOWN = 0, 52 SFP_S_INIT, 53 SFP_S_WAIT_LOS, 54 SFP_S_LINK_UP, 55 SFP_S_TX_FAULT, 56 SFP_S_REINIT, 57 SFP_S_TX_DISABLE, 58 }; 59 60 static const char *gpio_of_names[] = { 61 "mod-def0", 62 "los", 63 "tx-fault", 64 "tx-disable", 65 "rate-select0", 66 }; 67 68 static const enum gpiod_flags gpio_flags[] = { 69 GPIOD_IN, 70 GPIOD_IN, 71 GPIOD_IN, 72 GPIOD_ASIS, 73 GPIOD_ASIS, 74 }; 75 76 #define T_INIT_JIFFIES msecs_to_jiffies(300) 77 #define T_RESET_US 10 78 #define T_FAULT_RECOVER msecs_to_jiffies(1000) 79 80 /* SFP module presence detection is poor: the three MOD DEF signals are 81 * the same length on the PCB, which means it's possible for MOD DEF 0 to 82 * connect before the I2C bus on MOD DEF 1/2. 83 * 84 * The SFP MSA specifies 300ms as t_init (the time taken for TX_FAULT to 85 * be deasserted) but makes no mention of the earliest time before we can 86 * access the I2C EEPROM. However, Avago modules require 300ms. 87 */ 88 #define T_PROBE_INIT msecs_to_jiffies(300) 89 #define T_PROBE_RETRY msecs_to_jiffies(100) 90 91 /* SFP modules appear to always have their PHY configured for bus address 92 * 0x56 (which with mdio-i2c, translates to a PHY address of 22). 93 */ 94 #define SFP_PHY_ADDR 22 95 96 /* Give this long for the PHY to reset. */ 97 #define T_PHY_RESET_MS 50 98 99 static DEFINE_MUTEX(sfp_mutex); 100 101 struct sfp { 102 struct device *dev; 103 struct i2c_adapter *i2c; 104 struct mii_bus *i2c_mii; 105 struct sfp_bus *sfp_bus; 106 struct phy_device *mod_phy; 107 108 unsigned int (*get_state)(struct sfp *); 109 void (*set_state)(struct sfp *, unsigned int); 110 int (*read)(struct sfp *, bool, u8, void *, size_t); 111 112 struct gpio_desc *gpio[GPIO_MAX]; 113 114 unsigned int state; 115 struct delayed_work poll; 116 struct delayed_work timeout; 117 struct mutex sm_mutex; 118 unsigned char sm_mod_state; 119 unsigned char sm_dev_state; 120 unsigned short sm_state; 121 unsigned int sm_retries; 122 123 struct sfp_eeprom_id id; 124 }; 125 126 static unsigned long poll_jiffies; 127 128 static unsigned int sfp_gpio_get_state(struct sfp *sfp) 129 { 130 unsigned int i, state, v; 131 132 for (i = state = 0; i < GPIO_MAX; i++) { 133 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i]) 134 continue; 135 136 v = gpiod_get_value_cansleep(sfp->gpio[i]); 137 if (v) 138 state |= BIT(i); 139 } 140 141 return state; 142 } 143 144 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state) 145 { 146 if (state & SFP_F_PRESENT) { 147 /* If the module is present, drive the signals */ 148 if (sfp->gpio[GPIO_TX_DISABLE]) 149 gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE], 150 state & SFP_F_TX_DISABLE); 151 if (state & SFP_F_RATE_SELECT) 152 gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT], 153 state & SFP_F_RATE_SELECT); 154 } else { 155 /* Otherwise, let them float to the pull-ups */ 156 if (sfp->gpio[GPIO_TX_DISABLE]) 157 gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]); 158 if (state & SFP_F_RATE_SELECT) 159 gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]); 160 } 161 } 162 163 static int sfp__i2c_read(struct i2c_adapter *i2c, u8 bus_addr, u8 dev_addr, 164 void *buf, size_t len) 165 { 166 struct i2c_msg msgs[2]; 167 int ret; 168 169 msgs[0].addr = bus_addr; 170 msgs[0].flags = 0; 171 msgs[0].len = 1; 172 msgs[0].buf = &dev_addr; 173 msgs[1].addr = bus_addr; 174 msgs[1].flags = I2C_M_RD; 175 msgs[1].len = len; 176 msgs[1].buf = buf; 177 178 ret = i2c_transfer(i2c, msgs, ARRAY_SIZE(msgs)); 179 if (ret < 0) 180 return ret; 181 182 return ret == ARRAY_SIZE(msgs) ? len : 0; 183 } 184 185 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 addr, void *buf, 186 size_t len) 187 { 188 return sfp__i2c_read(sfp->i2c, a2 ? 0x51 : 0x50, addr, buf, len); 189 } 190 191 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c) 192 { 193 struct mii_bus *i2c_mii; 194 int ret; 195 196 if (!i2c_check_functionality(i2c, I2C_FUNC_I2C)) 197 return -EINVAL; 198 199 sfp->i2c = i2c; 200 sfp->read = sfp_i2c_read; 201 202 i2c_mii = mdio_i2c_alloc(sfp->dev, i2c); 203 if (IS_ERR(i2c_mii)) 204 return PTR_ERR(i2c_mii); 205 206 i2c_mii->name = "SFP I2C Bus"; 207 i2c_mii->phy_mask = ~0; 208 209 ret = mdiobus_register(i2c_mii); 210 if (ret < 0) { 211 mdiobus_free(i2c_mii); 212 return ret; 213 } 214 215 sfp->i2c_mii = i2c_mii; 216 217 return 0; 218 } 219 220 /* Interface */ 221 static unsigned int sfp_get_state(struct sfp *sfp) 222 { 223 return sfp->get_state(sfp); 224 } 225 226 static void sfp_set_state(struct sfp *sfp, unsigned int state) 227 { 228 sfp->set_state(sfp, state); 229 } 230 231 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len) 232 { 233 return sfp->read(sfp, a2, addr, buf, len); 234 } 235 236 static unsigned int sfp_check(void *buf, size_t len) 237 { 238 u8 *p, check; 239 240 for (p = buf, check = 0; len; p++, len--) 241 check += *p; 242 243 return check; 244 } 245 246 /* Helpers */ 247 static void sfp_module_tx_disable(struct sfp *sfp) 248 { 249 dev_dbg(sfp->dev, "tx disable %u -> %u\n", 250 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1); 251 sfp->state |= SFP_F_TX_DISABLE; 252 sfp_set_state(sfp, sfp->state); 253 } 254 255 static void sfp_module_tx_enable(struct sfp *sfp) 256 { 257 dev_dbg(sfp->dev, "tx disable %u -> %u\n", 258 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0); 259 sfp->state &= ~SFP_F_TX_DISABLE; 260 sfp_set_state(sfp, sfp->state); 261 } 262 263 static void sfp_module_tx_fault_reset(struct sfp *sfp) 264 { 265 unsigned int state = sfp->state; 266 267 if (state & SFP_F_TX_DISABLE) 268 return; 269 270 sfp_set_state(sfp, state | SFP_F_TX_DISABLE); 271 272 udelay(T_RESET_US); 273 274 sfp_set_state(sfp, state); 275 } 276 277 /* SFP state machine */ 278 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout) 279 { 280 if (timeout) 281 mod_delayed_work(system_power_efficient_wq, &sfp->timeout, 282 timeout); 283 else 284 cancel_delayed_work(&sfp->timeout); 285 } 286 287 static void sfp_sm_next(struct sfp *sfp, unsigned int state, 288 unsigned int timeout) 289 { 290 sfp->sm_state = state; 291 sfp_sm_set_timer(sfp, timeout); 292 } 293 294 static void sfp_sm_ins_next(struct sfp *sfp, unsigned int state, 295 unsigned int timeout) 296 { 297 sfp->sm_mod_state = state; 298 sfp_sm_set_timer(sfp, timeout); 299 } 300 301 static void sfp_sm_phy_detach(struct sfp *sfp) 302 { 303 phy_stop(sfp->mod_phy); 304 sfp_remove_phy(sfp->sfp_bus); 305 phy_device_remove(sfp->mod_phy); 306 phy_device_free(sfp->mod_phy); 307 sfp->mod_phy = NULL; 308 } 309 310 static void sfp_sm_probe_phy(struct sfp *sfp) 311 { 312 struct phy_device *phy; 313 int err; 314 315 msleep(T_PHY_RESET_MS); 316 317 phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR); 318 if (IS_ERR(phy)) { 319 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy)); 320 return; 321 } 322 if (!phy) { 323 dev_info(sfp->dev, "no PHY detected\n"); 324 return; 325 } 326 327 err = sfp_add_phy(sfp->sfp_bus, phy); 328 if (err) { 329 phy_device_remove(phy); 330 phy_device_free(phy); 331 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err); 332 return; 333 } 334 335 sfp->mod_phy = phy; 336 phy_start(phy); 337 } 338 339 static void sfp_sm_link_up(struct sfp *sfp) 340 { 341 sfp_link_up(sfp->sfp_bus); 342 sfp_sm_next(sfp, SFP_S_LINK_UP, 0); 343 } 344 345 static void sfp_sm_link_down(struct sfp *sfp) 346 { 347 sfp_link_down(sfp->sfp_bus); 348 } 349 350 static void sfp_sm_link_check_los(struct sfp *sfp) 351 { 352 unsigned int los = sfp->state & SFP_F_LOS; 353 354 /* FIXME: what if neither SFP_OPTIONS_LOS_INVERTED nor 355 * SFP_OPTIONS_LOS_NORMAL are set? For now, we assume 356 * the same as SFP_OPTIONS_LOS_NORMAL set. 357 */ 358 if (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED) 359 los ^= SFP_F_LOS; 360 361 if (los) 362 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0); 363 else 364 sfp_sm_link_up(sfp); 365 } 366 367 static void sfp_sm_fault(struct sfp *sfp, bool warn) 368 { 369 if (sfp->sm_retries && !--sfp->sm_retries) { 370 dev_err(sfp->dev, 371 "module persistently indicates fault, disabling\n"); 372 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0); 373 } else { 374 if (warn) 375 dev_err(sfp->dev, "module transmit fault indicated\n"); 376 377 sfp_sm_next(sfp, SFP_S_TX_FAULT, T_FAULT_RECOVER); 378 } 379 } 380 381 static void sfp_sm_mod_init(struct sfp *sfp) 382 { 383 sfp_module_tx_enable(sfp); 384 385 /* Wait t_init before indicating that the link is up, provided the 386 * current state indicates no TX_FAULT. If TX_FAULT clears before 387 * this time, that's fine too. 388 */ 389 sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES); 390 sfp->sm_retries = 5; 391 392 /* Setting the serdes link mode is guesswork: there's no 393 * field in the EEPROM which indicates what mode should 394 * be used. 395 * 396 * If it's a gigabit-only fiber module, it probably does 397 * not have a PHY, so switch to 802.3z negotiation mode. 398 * Otherwise, switch to SGMII mode (which is required to 399 * support non-gigabit speeds) and probe for a PHY. 400 */ 401 if (sfp->id.base.e1000_base_t || 402 sfp->id.base.e100_base_lx || 403 sfp->id.base.e100_base_fx) 404 sfp_sm_probe_phy(sfp); 405 } 406 407 static int sfp_sm_mod_probe(struct sfp *sfp) 408 { 409 /* SFP module inserted - read I2C data */ 410 struct sfp_eeprom_id id; 411 char vendor[17]; 412 char part[17]; 413 char sn[17]; 414 char date[9]; 415 char rev[5]; 416 u8 check; 417 int err; 418 419 err = sfp_read(sfp, false, 0, &id, sizeof(id)); 420 if (err < 0) { 421 dev_err(sfp->dev, "failed to read EEPROM: %d\n", err); 422 return -EAGAIN; 423 } 424 425 if (err != sizeof(id)) { 426 dev_err(sfp->dev, "EEPROM short read: %d\n", err); 427 return -EAGAIN; 428 } 429 430 /* Validate the checksum over the base structure */ 431 check = sfp_check(&id.base, sizeof(id.base) - 1); 432 if (check != id.base.cc_base) { 433 dev_err(sfp->dev, 434 "EEPROM base structure checksum failure: 0x%02x\n", 435 check); 436 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET, 437 16, 1, &id, sizeof(id.base) - 1, true); 438 return -EINVAL; 439 } 440 441 check = sfp_check(&id.ext, sizeof(id.ext) - 1); 442 if (check != id.ext.cc_ext) { 443 dev_err(sfp->dev, 444 "EEPROM extended structure checksum failure: 0x%02x\n", 445 check); 446 memset(&id.ext, 0, sizeof(id.ext)); 447 } 448 449 sfp->id = id; 450 451 memcpy(vendor, sfp->id.base.vendor_name, 16); 452 vendor[16] = '\0'; 453 memcpy(part, sfp->id.base.vendor_pn, 16); 454 part[16] = '\0'; 455 memcpy(rev, sfp->id.base.vendor_rev, 4); 456 rev[4] = '\0'; 457 memcpy(sn, sfp->id.ext.vendor_sn, 16); 458 sn[16] = '\0'; 459 memcpy(date, sfp->id.ext.datecode, 8); 460 date[8] = '\0'; 461 462 dev_info(sfp->dev, "module %s %s rev %s sn %s dc %s\n", 463 vendor, part, rev, sn, date); 464 465 /* We only support SFP modules, not the legacy GBIC modules. */ 466 if (sfp->id.base.phys_id != SFP_PHYS_ID_SFP || 467 sfp->id.base.phys_ext_id != SFP_PHYS_EXT_ID_SFP) { 468 dev_err(sfp->dev, "module is not SFP - phys id 0x%02x 0x%02x\n", 469 sfp->id.base.phys_id, sfp->id.base.phys_ext_id); 470 return -EINVAL; 471 } 472 473 return sfp_module_insert(sfp->sfp_bus, &sfp->id); 474 } 475 476 static void sfp_sm_mod_remove(struct sfp *sfp) 477 { 478 sfp_module_remove(sfp->sfp_bus); 479 480 if (sfp->mod_phy) 481 sfp_sm_phy_detach(sfp); 482 483 sfp_module_tx_disable(sfp); 484 485 memset(&sfp->id, 0, sizeof(sfp->id)); 486 487 dev_info(sfp->dev, "module removed\n"); 488 } 489 490 static void sfp_sm_event(struct sfp *sfp, unsigned int event) 491 { 492 mutex_lock(&sfp->sm_mutex); 493 494 dev_dbg(sfp->dev, "SM: enter %u:%u:%u event %u\n", 495 sfp->sm_mod_state, sfp->sm_dev_state, sfp->sm_state, event); 496 497 /* This state machine tracks the insert/remove state of 498 * the module, and handles probing the on-board EEPROM. 499 */ 500 switch (sfp->sm_mod_state) { 501 default: 502 if (event == SFP_E_INSERT) { 503 sfp_module_tx_disable(sfp); 504 sfp_sm_ins_next(sfp, SFP_MOD_PROBE, T_PROBE_INIT); 505 } 506 break; 507 508 case SFP_MOD_PROBE: 509 if (event == SFP_E_REMOVE) { 510 sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0); 511 } else if (event == SFP_E_TIMEOUT) { 512 int err = sfp_sm_mod_probe(sfp); 513 514 if (err == 0) 515 sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0); 516 else if (err == -EAGAIN) 517 sfp_sm_set_timer(sfp, T_PROBE_RETRY); 518 else 519 sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0); 520 } 521 break; 522 523 case SFP_MOD_PRESENT: 524 case SFP_MOD_ERROR: 525 if (event == SFP_E_REMOVE) { 526 sfp_sm_mod_remove(sfp); 527 sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0); 528 } 529 break; 530 } 531 532 /* This state machine tracks the netdev up/down state */ 533 switch (sfp->sm_dev_state) { 534 default: 535 if (event == SFP_E_DEV_UP) 536 sfp->sm_dev_state = SFP_DEV_UP; 537 break; 538 539 case SFP_DEV_UP: 540 if (event == SFP_E_DEV_DOWN) { 541 /* If the module has a PHY, avoid raising TX disable 542 * as this resets the PHY. Otherwise, raise it to 543 * turn the laser off. 544 */ 545 if (!sfp->mod_phy) 546 sfp_module_tx_disable(sfp); 547 sfp->sm_dev_state = SFP_DEV_DOWN; 548 } 549 break; 550 } 551 552 /* Some events are global */ 553 if (sfp->sm_state != SFP_S_DOWN && 554 (sfp->sm_mod_state != SFP_MOD_PRESENT || 555 sfp->sm_dev_state != SFP_DEV_UP)) { 556 if (sfp->sm_state == SFP_S_LINK_UP && 557 sfp->sm_dev_state == SFP_DEV_UP) 558 sfp_sm_link_down(sfp); 559 if (sfp->mod_phy) 560 sfp_sm_phy_detach(sfp); 561 sfp_sm_next(sfp, SFP_S_DOWN, 0); 562 mutex_unlock(&sfp->sm_mutex); 563 return; 564 } 565 566 /* The main state machine */ 567 switch (sfp->sm_state) { 568 case SFP_S_DOWN: 569 if (sfp->sm_mod_state == SFP_MOD_PRESENT && 570 sfp->sm_dev_state == SFP_DEV_UP) 571 sfp_sm_mod_init(sfp); 572 break; 573 574 case SFP_S_INIT: 575 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) 576 sfp_sm_fault(sfp, true); 577 else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) 578 sfp_sm_link_check_los(sfp); 579 break; 580 581 case SFP_S_WAIT_LOS: 582 if (event == SFP_E_TX_FAULT) 583 sfp_sm_fault(sfp, true); 584 else if (event == 585 (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED ? 586 SFP_E_LOS_HIGH : SFP_E_LOS_LOW)) 587 sfp_sm_link_up(sfp); 588 break; 589 590 case SFP_S_LINK_UP: 591 if (event == SFP_E_TX_FAULT) { 592 sfp_sm_link_down(sfp); 593 sfp_sm_fault(sfp, true); 594 } else if (event == 595 (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED ? 596 SFP_E_LOS_LOW : SFP_E_LOS_HIGH)) { 597 sfp_sm_link_down(sfp); 598 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0); 599 } 600 break; 601 602 case SFP_S_TX_FAULT: 603 if (event == SFP_E_TIMEOUT) { 604 sfp_module_tx_fault_reset(sfp); 605 sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES); 606 } 607 break; 608 609 case SFP_S_REINIT: 610 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) { 611 sfp_sm_fault(sfp, false); 612 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) { 613 dev_info(sfp->dev, "module transmit fault recovered\n"); 614 sfp_sm_link_check_los(sfp); 615 } 616 break; 617 618 case SFP_S_TX_DISABLE: 619 break; 620 } 621 622 dev_dbg(sfp->dev, "SM: exit %u:%u:%u\n", 623 sfp->sm_mod_state, sfp->sm_dev_state, sfp->sm_state); 624 625 mutex_unlock(&sfp->sm_mutex); 626 } 627 628 static void sfp_start(struct sfp *sfp) 629 { 630 sfp_sm_event(sfp, SFP_E_DEV_UP); 631 } 632 633 static void sfp_stop(struct sfp *sfp) 634 { 635 sfp_sm_event(sfp, SFP_E_DEV_DOWN); 636 } 637 638 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo) 639 { 640 /* locking... and check module is present */ 641 642 if (sfp->id.ext.sff8472_compliance) { 643 modinfo->type = ETH_MODULE_SFF_8472; 644 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN; 645 } else { 646 modinfo->type = ETH_MODULE_SFF_8079; 647 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN; 648 } 649 return 0; 650 } 651 652 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee, 653 u8 *data) 654 { 655 unsigned int first, last, len; 656 int ret; 657 658 if (ee->len == 0) 659 return -EINVAL; 660 661 first = ee->offset; 662 last = ee->offset + ee->len; 663 if (first < ETH_MODULE_SFF_8079_LEN) { 664 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN); 665 len -= first; 666 667 ret = sfp->read(sfp, false, first, data, len); 668 if (ret < 0) 669 return ret; 670 671 first += len; 672 data += len; 673 } 674 if (first >= ETH_MODULE_SFF_8079_LEN && 675 first < ETH_MODULE_SFF_8472_LEN) { 676 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN); 677 len -= first; 678 first -= ETH_MODULE_SFF_8079_LEN; 679 680 ret = sfp->read(sfp, true, first, data, len); 681 if (ret < 0) 682 return ret; 683 } 684 return 0; 685 } 686 687 static const struct sfp_socket_ops sfp_module_ops = { 688 .start = sfp_start, 689 .stop = sfp_stop, 690 .module_info = sfp_module_info, 691 .module_eeprom = sfp_module_eeprom, 692 }; 693 694 static void sfp_timeout(struct work_struct *work) 695 { 696 struct sfp *sfp = container_of(work, struct sfp, timeout.work); 697 698 rtnl_lock(); 699 sfp_sm_event(sfp, SFP_E_TIMEOUT); 700 rtnl_unlock(); 701 } 702 703 static void sfp_check_state(struct sfp *sfp) 704 { 705 unsigned int state, i, changed; 706 707 state = sfp_get_state(sfp); 708 changed = state ^ sfp->state; 709 changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT; 710 711 for (i = 0; i < GPIO_MAX; i++) 712 if (changed & BIT(i)) 713 dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i], 714 !!(sfp->state & BIT(i)), !!(state & BIT(i))); 715 716 state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT); 717 sfp->state = state; 718 719 rtnl_lock(); 720 if (changed & SFP_F_PRESENT) 721 sfp_sm_event(sfp, state & SFP_F_PRESENT ? 722 SFP_E_INSERT : SFP_E_REMOVE); 723 724 if (changed & SFP_F_TX_FAULT) 725 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ? 726 SFP_E_TX_FAULT : SFP_E_TX_CLEAR); 727 728 if (changed & SFP_F_LOS) 729 sfp_sm_event(sfp, state & SFP_F_LOS ? 730 SFP_E_LOS_HIGH : SFP_E_LOS_LOW); 731 rtnl_unlock(); 732 } 733 734 static irqreturn_t sfp_irq(int irq, void *data) 735 { 736 struct sfp *sfp = data; 737 738 sfp_check_state(sfp); 739 740 return IRQ_HANDLED; 741 } 742 743 static void sfp_poll(struct work_struct *work) 744 { 745 struct sfp *sfp = container_of(work, struct sfp, poll.work); 746 747 sfp_check_state(sfp); 748 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies); 749 } 750 751 static struct sfp *sfp_alloc(struct device *dev) 752 { 753 struct sfp *sfp; 754 755 sfp = kzalloc(sizeof(*sfp), GFP_KERNEL); 756 if (!sfp) 757 return ERR_PTR(-ENOMEM); 758 759 sfp->dev = dev; 760 761 mutex_init(&sfp->sm_mutex); 762 INIT_DELAYED_WORK(&sfp->poll, sfp_poll); 763 INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout); 764 765 return sfp; 766 } 767 768 static void sfp_cleanup(void *data) 769 { 770 struct sfp *sfp = data; 771 772 cancel_delayed_work_sync(&sfp->poll); 773 cancel_delayed_work_sync(&sfp->timeout); 774 if (sfp->i2c_mii) { 775 mdiobus_unregister(sfp->i2c_mii); 776 mdiobus_free(sfp->i2c_mii); 777 } 778 if (sfp->i2c) 779 i2c_put_adapter(sfp->i2c); 780 kfree(sfp); 781 } 782 783 static int sfp_probe(struct platform_device *pdev) 784 { 785 struct sfp *sfp; 786 bool poll = false; 787 int irq, err, i; 788 789 sfp = sfp_alloc(&pdev->dev); 790 if (IS_ERR(sfp)) 791 return PTR_ERR(sfp); 792 793 platform_set_drvdata(pdev, sfp); 794 795 err = devm_add_action(sfp->dev, sfp_cleanup, sfp); 796 if (err < 0) 797 return err; 798 799 if (pdev->dev.of_node) { 800 struct device_node *node = pdev->dev.of_node; 801 struct device_node *np; 802 803 np = of_parse_phandle(node, "i2c-bus", 0); 804 if (np) { 805 struct i2c_adapter *i2c; 806 807 i2c = of_find_i2c_adapter_by_node(np); 808 of_node_put(np); 809 if (!i2c) 810 return -EPROBE_DEFER; 811 812 err = sfp_i2c_configure(sfp, i2c); 813 if (err < 0) { 814 i2c_put_adapter(i2c); 815 return err; 816 } 817 } 818 819 for (i = 0; i < GPIO_MAX; i++) { 820 sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev, 821 gpio_of_names[i], gpio_flags[i]); 822 if (IS_ERR(sfp->gpio[i])) 823 return PTR_ERR(sfp->gpio[i]); 824 } 825 826 sfp->get_state = sfp_gpio_get_state; 827 sfp->set_state = sfp_gpio_set_state; 828 } 829 830 sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops); 831 if (!sfp->sfp_bus) 832 return -ENOMEM; 833 834 /* Get the initial state, and always signal TX disable, 835 * since the network interface will not be up. 836 */ 837 sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE; 838 839 if (sfp->gpio[GPIO_RATE_SELECT] && 840 gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT])) 841 sfp->state |= SFP_F_RATE_SELECT; 842 sfp_set_state(sfp, sfp->state); 843 sfp_module_tx_disable(sfp); 844 rtnl_lock(); 845 if (sfp->state & SFP_F_PRESENT) 846 sfp_sm_event(sfp, SFP_E_INSERT); 847 rtnl_unlock(); 848 849 for (i = 0; i < GPIO_MAX; i++) { 850 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i]) 851 continue; 852 853 irq = gpiod_to_irq(sfp->gpio[i]); 854 if (!irq) { 855 poll = true; 856 continue; 857 } 858 859 err = devm_request_threaded_irq(sfp->dev, irq, NULL, sfp_irq, 860 IRQF_ONESHOT | 861 IRQF_TRIGGER_RISING | 862 IRQF_TRIGGER_FALLING, 863 dev_name(sfp->dev), sfp); 864 if (err) 865 poll = true; 866 } 867 868 if (poll) 869 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies); 870 871 return 0; 872 } 873 874 static int sfp_remove(struct platform_device *pdev) 875 { 876 struct sfp *sfp = platform_get_drvdata(pdev); 877 878 sfp_unregister_socket(sfp->sfp_bus); 879 880 return 0; 881 } 882 883 static const struct of_device_id sfp_of_match[] = { 884 { .compatible = "sff,sfp", }, 885 { }, 886 }; 887 MODULE_DEVICE_TABLE(of, sfp_of_match); 888 889 static struct platform_driver sfp_driver = { 890 .probe = sfp_probe, 891 .remove = sfp_remove, 892 .driver = { 893 .name = "sfp", 894 .of_match_table = sfp_of_match, 895 }, 896 }; 897 898 static int sfp_init(void) 899 { 900 poll_jiffies = msecs_to_jiffies(100); 901 902 return platform_driver_register(&sfp_driver); 903 } 904 module_init(sfp_init); 905 906 static void sfp_exit(void) 907 { 908 platform_driver_unregister(&sfp_driver); 909 } 910 module_exit(sfp_exit); 911 912 MODULE_ALIAS("platform:sfp"); 913 MODULE_AUTHOR("Russell King"); 914 MODULE_LICENSE("GPL v2"); 915